synced 11 MIN AGO
01 Record

CVE-2021-22959

The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.

UnratedPUBLISHEDCNA: hackerone
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
3.15% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 87.6% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-11-15 14:45Z4 YR AGO
Last updated
2025-04-30 22:24Z1 YR AGO
Reserved
2021-01-06
Assigning CNA
hackerone
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base
Data version
5.1
Document digest
9dacba54ac36244ef6c5a76f1965170c926321e1748975f4728069f7f7bdaed0

05 Affected products

VendorProductVersionsPlatforms
NodeJSNode4.0 to < 4.*, 5.0 to < 5.*, 6.0 to < 6.*, 7.0 to < 7.*, 8.0 to < 8.*, 9.0 to < 9.*, 10.0 to < 10.*, 11.0 to < 11.*, 12.0 to < 12.22.7, 13.0 to < 13.*, 14.0 to < 14.18.1, 15.0 to < 15.*, 16.0 to < 16.11.1—

06 References

07 Fixed in

AlmaLinux 8

  • nodejs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-docs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-full-i18n
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-nodemon
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.0.15-1.module_el8.5.0+2605+45d748af
    • Affected before 2.0.15-1.module_el8.5.0+2618+8d46dafd
    • Affected before 2.0.15-1.module_el8.6.0+2904+f21ad6f4
  • nodejs-packaging
    Fixed

    A version is affected if any line below covers it.

    • Affected before 23-3.module_el8.4.0+2522+3bd42762
    • Affected before 23-3.module_el8.5.0+2618+8d46dafd
    • Affected before 25-1.module_el8.5.0+246+05401605
    • Affected before 25-1.module_el8.5.0+2605+45d748af
  • npm
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:6.14.15-1.14.18.2.2.module_el8.5.0+254+b4526b16
    • Affected before 1:6.14.15-1.14.18.2.2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:8.1.2-1.16.13.1.3.module_el8.5.0+246+05401605
    • Affected before 1:8.1.2-1.16.13.1.3.module_el8.5.0+2605+45d748af

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • nodejs
    Fixed in 16.11.1-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • nodejs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-docs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-full-i18n
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:14.18.2-2.module_el8.5.0+254+b4526b16
    • Affected before 1:14.18.2-2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:16.13.1-3.module_el8.5.0+246+05401605
    • Affected before 1:16.13.1-3.module_el8.5.0+2605+45d748af
  • nodejs-nodemon
    Fixed

    A version is affected if any line below covers it.

    • Affected before 2.0.15-1.module_el8.5.0+2605+45d748af
    • Affected before 2.0.15-1.module_el8.5.0+2618+8d46dafd
    • Affected before 2.0.15-1.module_el8.6.0+2904+f21ad6f4
  • nodejs-packaging
    Fixed

    A version is affected if any line below covers it.

    • Affected before 23-3.module_el8.4.0+2522+3bd42762
    • Affected before 23-3.module_el8.5.0+2618+8d46dafd
    • Affected before 25-1.module_el8.5.0+246+05401605
    • Affected before 25-1.module_el8.5.0+2605+45d748af
  • npm
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:6.14.15-1.14.18.2.2.module_el8.5.0+254+b4526b16
    • Affected before 1:6.14.15-1.14.18.2.2.module_el8.5.0+2618+8d46dafd
    • Affected before 1:8.1.2-1.16.13.1.3.module_el8.5.0+246+05401605
    • Affected before 1:8.1.2-1.16.13.1.3.module_el8.5.0+2605+45d748af

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • nodejs
    Fixed in 12.22.7~dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • nodejs
    Fixed in 12.22.7~dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • nodejs
    Fixed in 12.22.7~dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.